WO1997046828A1 - Chauffe-eau a serpentin constitue d'un tube ondule en spirale - Google Patents

Chauffe-eau a serpentin constitue d'un tube ondule en spirale Download PDF

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Publication number
WO1997046828A1
WO1997046828A1 PCT/NZ1997/000072 NZ9700072W WO9746828A1 WO 1997046828 A1 WO1997046828 A1 WO 1997046828A1 NZ 9700072 W NZ9700072 W NZ 9700072W WO 9746828 A1 WO9746828 A1 WO 9746828A1
Authority
WO
WIPO (PCT)
Prior art keywords
boiler
pipe
coil
spirally corrugated
corrugated pipe
Prior art date
Application number
PCT/NZ1997/000072
Other languages
English (en)
Inventor
Rodney Mitchell Innes
Murray James Kite
Original Assignee
Waipuna International Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Waipuna International Limited filed Critical Waipuna International Limited
Priority to AU29828/97A priority Critical patent/AU2982897A/en
Priority to NZ332261A priority patent/NZ332261A/xx
Publication of WO1997046828A1 publication Critical patent/WO1997046828A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/08—Tubular elements crimped or corrugated in longitudinal section
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M21/00—Apparatus for the destruction of unwanted vegetation, e.g. weeds
    • A01M21/04—Apparatus for destruction by steam, chemicals, burning, or electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F22B21/22—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes of form other than straight or substantially straight
    • F22B21/26—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes of form other than straight or substantially straight bent helically, i.e. coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/12—Forms of water tubes, e.g. of varying cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/06—Portable or mobile, e.g. collapsible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F24H1/43—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes helically or spirally coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration

Definitions

  • This invention lelates in general to boilers and has particular (though not exclusive) application to the field of vegetation control and moie particularly to vegetation control or weed-killing, comprising exposure to hot water and/or steam generated in such a boiler
  • the boiler can also be used for steam cleaning, hot water production, and the like
  • a boiler is a device tor the process of generating heat and transferring it to a contained body of water (or other fucid which as a consequence has its temperature raised to its boiling point or beyond Known boilers often include means to enhance a combustion process, and/or means to enhance a heat transfer process and/or means to contain a fluid under sometimes a considerable pressure because steam engines and the like ultimately rely on the pressure generated as a result of heating Some boilers are developed with a primary requirement of being capable of providing a rapid initiation of steam generation soon after first ignition of a combustion process
  • Boilers having a length of liquid-carrying pipe passing through a heated zone within a thermally insulated chamber are known but there are limitations to the effectiveness of heat transfer from gas through pipe and into liquid in boilers of this design They generally have a relatively high resistance to water flow (friction), considerable weight, hold a significant quantity of liquid within the pipes, and therefore are not ideal for many applications
  • the invention provides a boiler of the type including a burner and a container for liquid within a chamber, wherein the container for liquid comprises a spirally corrugated pipe having an inlet and an outlet
  • the pipe is a spirally corrugated pipe having external peaks and troughs
  • the pipe also has internal peaks and troughs corresponding to the external troughs and peaks respectively
  • the spirally corrugated pipe is formed with an optimum balance between the depth of the corrugations and the resulting increase in f ⁇ ctional flow of the liquid
  • the spirally corrugated pipe is made of stainless steel, and preferably this can withstand working pressures at a working temperature without failure.
  • the spirally corrugated pipe is shaped in the form of a coil.
  • the coil has one or more layers.
  • the coil is helical, with a circular outline although optionally the coil may have a non-circular outline.
  • each turn of any one layer of the coil is adjacent to, and in light contact with an adjoining turn.
  • each turn of any one later of the coil makes light contact at the peaks of the corrugations with an adjoining turn, thereby allowing gas to pass between the intervening spaces.
  • the invention provides a boiler including a single helix of pipe or tube capable of holding a fluid to be heated at a working pressure and conducting the fluid past a source of heat, such as hot gases emanating from a burner.
  • the invention provides a boiler in which at least one baffle capable of redirecting the flow of gas increases the opportunity for heat to be transferred from the gas to the pipe or tube.
  • the invention provides boiler means for controlling the growth of vegetation by providing for the generation of heated water and/or steam at a time and place appropriate for vegetation control.
  • the boiler means is compact and optimised for portability.
  • Fig 1 is a longitudinal section through a boiler according to the invention
  • Fig 2 shows a short length of spirally corrugated heat exchanger pipe prior to being formed into the helix of figure 1
  • Fig 3 shows two short sections of adjacent turns of the helix of figure 1 with the adjacent turns lightly touching or nearly touching one another at the peaks of the spirally corrugated heat exchanger pipe
  • a boiler for commercial use should be optimised in a number of ways though most of them (weight, complexity, efficiency, safety, response speed, etc) can be reduced into economic costs
  • the boiler under discussion employs a deliberately deformed tubular fluid-carrying member (basically having the shape of a pipe) as its basic heat exchange element, in order to enhance the heat exchange process by promoting non-laminar flow within the member so that all portions of the fluid are exposed in turn to the heat diffusing through the walls of the pipe.
  • the exact mechanism by which flow is disturbed can be important because many such mechanisms also result in significantly increased resistance to flow
  • the invention provides a preferably cylindrical boiler 100 comprising a burner 102 to burn a fuel, and a helical coil 106 of metal tubing, all held within a heat-insulating lining 101
  • a boiler can be considered as a special type of heat exchanger for transferring heat from a source into a fluid to be heated
  • the example boiler has inputs including fuel, air, and cold water (at 105), and its outputs include waste exhaust gases 103 and hot water 104 (which may in use be boiling, pressurised, or be at least partly converted into steam)
  • the course of the hot gas issuing from the burner is shown with dashed open arrows
  • a set of baffles, 108, 109, and 1 10 help to ensure that the gases pass between the turns of the coil of pipe several times before reaching the exhaust chimney 103
  • the boiler is vertical and has a downdraft burner 102 and an insulated flame teflector 1 12 to assist in redirecting the exhaust gases towards the helical coil and baffles
  • the pipe or tube used in the invention is made of stainless steel, as this type of material can withstand the working pressures at a working temperature and minimise the risk of corrosion leading to a potentially catastrophic failure at a later date
  • it could be made of copper, although this metal can be corroded especially with the presence of electrochemical effects (near dissimilar metals), and has a lower melting point
  • the additional strength of stainless steel allows use of a pipe having a thinner wall and hence less thermal resistance We have found that a 1 mm wall thickness is suitable, with 20 mm diameter pipe
  • This example boiler includes a single laver of coiled pipe or tube carrying water past hot gases
  • Previous boilers of similar output had to use several layers of coiled pipe in order to provide a similar rate of heat transfer, and they were relatively expensive, hard to make, and wasteful of resources as well as providing an impediment to flow because of the extra length of pipe It is possible to make a multi-layered coil for the boiler of this invention and retain the advantages of the spirally corrugated pipe because otherwise even more pipe material would be required
  • One improvement that the invention employs in order to make a single spiral work effectively is to make use of a pipe or tube that is spirally corrugated before being bent into a coil or helix, that is, its wall is deformed so that it somewhat resembles a rope as shown at 201 in Fig 2
  • This Figure shows a short section of spirally corrugated pipe, wherein the details impressed on the walls of the pipe on the side of the pipe towards the viewer is drawn in solid lines 202 and the far side is as dashed lines 203
  • One preferred pattern resembles a screw having four starts, and is used with 20 mm pipe It is possible to vary the number of starts to a higher or lower number, the height of the corrugations, the pitch of the turns, and the shape of the corrugations and a preferred pattern is one that provides an optimum balance between a minimised impediment to flow and a maximised rate of heat transfer across the walls of the pipe, when in use
  • This spirally corrugated pipe is preferably manufacture by the method described in PCT
  • a further advantage of the spirally corrugated pipe is that the turns of the coil can be made to lightly touch or almost touch at the peaks 201 of the corrugations to provide relatively narrow spaces 208 between adjacent turns 206, 207 as shown in figure 3 This leads to increased turbulence in the hot gases and thereby aids heat transfer Thus we prefer to wind the coils with the layers just touching, though generally not, of course, tightly lntermeshing
  • Boilers made according to the enclosed principles have the major advantage that there is less heat exchange material in use than in prior-art boilers having comparable outputs
  • boilers made according to the invention are generally lighter, cheaper, easier to make, and have more latitude to increase safety limits than their antecedents
  • two or three concentric spirals of pipe used to be used to extract a similar amount of heat from the burner gases In the embodiment described, there is just one spiral and the boiler is more optimised.
  • a significant improvement in flow resistance is also evident
  • One application of this invention is as a means for controlling the growth of vegetation by applying heated water and/or steam to ground including the unwanted vegetation (that is, weeds).
  • This type of boiler can of course be used for other applications than in herbicidal applications, wherein water is desired to be converted into hot water, or steam, or a mixture of the two.
  • Other applications include domestic hot water heating, all kinds of steam cleaning, generating steam for motive power, food processing, and industrial applications.
  • the boiler is illustrated as a vertical boiler but it can also be used as a horizontal boiler, with suitable changes to the chimney.
  • baffles themselves could be made of pipe material and could also carry the fluid to be heated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Insects & Arthropods (AREA)
  • Pest Control & Pesticides (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention concerne un chauffe-eau compact (100) adapté à une utilisation portative pour produire de l'eau chaude et/ou de la vapeur. Le chauffe-eau (100) ne comprend qu'un serpentin (106) constitué d'un tube en métal ondulé en spirale d'une épaisseur de 1 mm, d'un diamètre de 20 mm, en acier inoxydable enroulé en une seule hélice, les sommets des ondulations des tours adjacents se touchant mutuellement. Le tube ondulé en spirale ressemble à une vis présentant quatre points de départ. Une série de chicanes concentriques (108, 109, 110) assure que les gaz chauds provenant d'un brûleur passent sur ou entre le tube de l'hélice (106) plusieurs fois, améliorant ainsi le transfert de chaleur vers l'eau contenue à l'intérieur du tube.
PCT/NZ1997/000072 1996-06-05 1997-06-04 Chauffe-eau a serpentin constitue d'un tube ondule en spirale WO1997046828A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU29828/97A AU2982897A (en) 1996-06-05 1997-06-04 Boiler having a helical coil of spirally corrugated pipe
NZ332261A NZ332261A (en) 1996-06-05 1997-06-04 Boiler having a helical coil of spirally corrugated pipe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ28060296 1996-06-05
NZ280602 1996-06-05

Publications (1)

Publication Number Publication Date
WO1997046828A1 true WO1997046828A1 (fr) 1997-12-11

Family

ID=19925567

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ1997/000072 WO1997046828A1 (fr) 1996-06-05 1997-06-04 Chauffe-eau a serpentin constitue d'un tube ondule en spirale

Country Status (2)

Country Link
AU (1) AU2982897A (fr)
WO (1) WO1997046828A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100498055C (zh) * 2005-03-24 2009-06-10 万演文 无压高温蒸汽炉
EP2301799A1 (fr) * 2008-06-17 2011-03-30 Dong Su Park Appareil mobile d 'alimentation en eau chaude à l extérieur
EP4186363A1 (fr) * 2021-11-25 2023-05-31 Michael Sappl Dispositif de lutte contre les mauvaises herbes, système de lutte contre les mauvaises herbes et véhicule

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3519315A1 (de) * 1985-05-30 1986-12-04 kabelmetal electro GmbH, 3000 Hannover Waermetauscher aus einem huellrohr und einem im innern des huellrohres angeordneten wendelartig verlaufenden rohr
US4677939A (en) * 1985-01-21 1987-07-07 Gaz De France Heat exchanger and application to a fluid heating apparatus, particularly a domestic hot water accumulator
DE3612770A1 (de) * 1986-04-16 1987-10-22 Wolfgang Haferkamp Waermetauscher
US4750452A (en) * 1984-08-07 1988-06-14 Vulcan Australia Limited Water heater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4750452A (en) * 1984-08-07 1988-06-14 Vulcan Australia Limited Water heater
US4677939A (en) * 1985-01-21 1987-07-07 Gaz De France Heat exchanger and application to a fluid heating apparatus, particularly a domestic hot water accumulator
DE3519315A1 (de) * 1985-05-30 1986-12-04 kabelmetal electro GmbH, 3000 Hannover Waermetauscher aus einem huellrohr und einem im innern des huellrohres angeordneten wendelartig verlaufenden rohr
DE3612770A1 (de) * 1986-04-16 1987-10-22 Wolfgang Haferkamp Waermetauscher

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT ABSTRACT, Accession No. 77-35824Y/20, Classes J08, Q78; & SU,A,531 993, (ANDREEV), 7 October 1976. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100498055C (zh) * 2005-03-24 2009-06-10 万演文 无压高温蒸汽炉
EP2301799A1 (fr) * 2008-06-17 2011-03-30 Dong Su Park Appareil mobile d 'alimentation en eau chaude à l extérieur
EP2301799A4 (fr) * 2008-06-17 2012-08-15 Dong Su Park Appareil mobile d 'alimentation en eau chaude à l extérieur
EP4186363A1 (fr) * 2021-11-25 2023-05-31 Michael Sappl Dispositif de lutte contre les mauvaises herbes, système de lutte contre les mauvaises herbes et véhicule

Also Published As

Publication number Publication date
AU2982897A (en) 1998-01-05

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